This 3D printed bowtie ain't cheap ($115), but it's got a clever little fitting (it buttons straight onto your collar-button), and it also looks like a fun project to recreate with your local hackspace's 3D printer.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.